The operations of secret intelligence agencies aiming at the manipulation of public opinion generally involve a combination of cynical deception with the pathetic gullibility of the targeted populations.
There is ample reason to believe that the case of Edward Joseph Snowden fits into this pattern. We are likely dealing here with a limited hangout operation, in which carefully selected and falsified documents and other materials are deliberately revealed by an insider who pretends to be a fugitive rebelling against the excesses of some oppressive or dangerous government agency.

I hate to do this but I feel obligated to share, as the story unfolds, my creeping concern that the NSA leaker is not who he purports to be, and that the motivations involved in the story may be more complex than they appear to be.